Spark-arrester for arc lamps



(No Model.)

E. M. GLARK.

SPARK ARRESTER FOR ARC LAMPS.

No. 531,159. Patented Dec. 18,1894.

U ITED STATES- P TENT OFFIC EDWIN MJoLARK, on DETROIT, MICHIGAN.

SPARK-ARRESTER FOR ARC LAMPS.

SPECIFICATION forming part of Letters Patent No. 531,159, dated December 18, 1894.

Application filed April 24, 1894- To all whom it may concern:

Be it known that I, EDWIN M. CLARK, a

citizen of the United States, residing at Deglobe.

troit, in the county of -Wayne and State of Michigan, have invented certain new and useful Improvements in Spark-Arresters for Arc Lamps, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention consists in the peculiar construction of a screen adapted to be adjustably secured upon'an arc lamp or the frame thereof to close the topof the globe, so that the sparks from the carbon cannot escape through the opening in the top of the globe.

The invention further consists in the construction of this screen, so that it can be adjusted in relation to the globe to permit access to the carbons for renewal or adjustment, and further in the peculiar construction,arrangement and combination of the various parts.

Figurel is a perspective view of 'an arc lamp showing my invention applied thereto, the parts being broken away. Fig. 2 is a vertical, central section through the frame showing the screen adjusted away from the Fig. 3 is a horizoutalsection through the screenand illustrating its construction. A is the top plate. B is the case; 0, the hanger rods, and D the cross-bar at the lower end of 'the hanger rods for supporting the stationary carbon.

The casing B is adapted to contain any suitable devices for supporting and feeding the upper or movable carbon, these parts being of known and usual construction.

E is the globe surrounding the meeting 1ends of the carbon and having the usual open In the use of such are lamps, it is found desirable to provide means to prevent the sparks from the carbons from floating upward out of the open top of the globe and into the room where they may come in contact with inflammable material and thus set fire to the building in which they are located. It is also desirable to protect the lamps from insects at certain seasons of the year, and my invention is intended to provide a screen Serial No. 508,770. (No model.)

which will eifect these results. To this end I preferably construct the device as follows:

F is a head preferably of sheet metal, centrally apertured, as shown at G and adapted to be secured in any suitable mannerupon the casing B. This head has the depending guide flange H. The means which I have shown for securing this to the casing consists of the angle brackets I. Slidingly engaging on the guide flange H of this head is a suitable screen .frame ofa length equal to the distance between the case and the top of the globe and having a'suitable foot at the lower end, adapted to engage with the globe, so that it may entirely inclose the space above the globe when lowered. This may be done by sliding it down over the head until the.

lower edge rests upon the globe as shown in Fig. 1, and if it is desired to obtain access to the interior of the globe or the carbons Within the screen it is lifted vertically, sliding upon the edge to the position shown in Fig. 2. The construction which I preferably employ in manufacturing this screen is shown in the drawings, and comprises an upper ring a, and a lower ring b connected together by the bars or connecting rods 0. ing ofwire cloth, preferably secured to the inner face of the frame thus formed.

If desired I may add an inner series of bars e which act as guide bars in raising and low ering the screen frame upon the head. The lower bar I) I preferably provide with a curved flange h adapted to conform in shape to the top of the globe so as to make a tight joint therefor.

The lamp which I have shown this applied to is what is known as the Brush lamp, but it isevident that it may be applied as well to other forms of lamps and that other means can readily be suggested for guiding it in its vertical movement and for modifying the construction, but I do not desire to be limited to the particular form shown.

What I claim as my invention is-= In an arc lamp, the combination with the globe and the supporting bracket, of the depending casing B arranged centrally above the globe, an imperforate circular head F on the lower end of the casing extending out cl is a suitable coverbeyond the same, an open frame comprising In testimony whereofIaflix my signaturein a, lower ring h fitted loosely on the globe, the presence of two witnesses. upper ring a loosely fitted around the head F, and the vertical connecting bars 0 be- 5 tween the rings, and. the cylindrical screen Witnesses:

carried by the open frame, substantially as M. B. ODOGHERTY, described. 0. F. BARTHEL.

EDWIN M. CLARK. 

